Core-making machine



. April 24, :92a l 1,667,079

F. PIETRUSIAK CORE MAKING MACHINE Filed May 20, 1927 \\\\\\I\Y s/////////// ///////1} Troja/var Patented Apr. 24, 19:28.

vFRANK 'PIETRUSIKAL oF'sT. PAUL, MINNESOTA.

ooRE-iuAxiNG MACHINE;

Application filed May 20',

My invention relates to a molding inachine particularly usefulin foundries, but also adaptable for other lines of `manufacture such as making cement blocks, bricks and the like. The main object of'the inven-y simple and highly effi-v lion is to providea cient machine formakmgcoresefor foundry use. These and other objects will appearink the 'following description and as illustrated y rack teeth 26T engaged by a. toothed sector 27 keyed on'ashaft 28 in a bearing 29 mountin the accompanyingdrawing,fin'which Fig. 1 is a top or plan view of one form of my device which involves a hand operated tamping or pressure device. -f

Fig. 2 is a side elevation ol Fig. 1. Fig. 3 is an enlarged detail view of certain core supporting` means for the cap cyl'- inder of'. mydevice, about as on line' in Fig. 4 is a vertical sectional V elevation of my improved machine including air pressed tamping or packing'means. Y l

Fig.- 5 is an enlarged sectional view of the air control valve about as on line. 5-5 in Fig. 4.

Referring tothe drawing by-ret'erence numerals, 1() designates'an elevated horizontal tableheld in fixed spaced relation above a base platform 11 by suitable spacer rods 12,

said latter' base .normally resting on corner f blocks 13 or other suitable spaclng means lengaging a supporting-surface or floor-114. .15 is annpright cylindrical shell with one end resting on platform 11 'and lts Yupper end normally projecting above an aperture shell ifs-.designated 15T (Figs. 2and 4), and'is Y yspaced from the lowerpart 15- (in Fig.- 4) v intable 10. rIhe upper part of said by integral wall parts 15X fOrmingaIcirCular row of openings 15A. molding receptacle having a removable cap 17, and is of a diameter to rest concentrically on the upper perimeter of shell 15T f (see l Fig. i).

18 is al collar fixed on table 101concentrio about the upper and-open end ofthe shell 15 and flush with the latter, said collar preferably being'an integral part of said shell 15. 185A area number .of circular-ly spaced apertures through said collar, each' occupied by a vertically slidable L-shaped guide mem`i y ber 19.

jected upwardly above the top of shell 15 to retain the member 16 concentricallyfbetween them, by compression springs 2() about a rod 19R fixed one to the lower end of each guide and extending downwardly 16 is a cylindrical 1y These lugs are all normally pro through a bracket 23 and suitably fixed as at 21 in a ring 22 loosely encircling shell 15.

`1n- Fig.'2, I haveillustrated the cylinder 15T only mounted in elevated position relative to base 11 in abracket 24 fixed to both' the upper and lower tables 10 and 11.' In.

this lever operated type of my device a pistonY 25 is reciprocableA within thefoylinder by adepending guided piston rod 26 having edon stand 11, said'v shaft having 'a hand lever 30, keyed to vone end. rMoving the lever as to the left inFigf2, raises the piston rod and piston in shell 15. In Fig. 4 which illustrates an air or hydraulic operation, the

piston rod 26 extends/upwardly Vfrom piston e 25 vand carries another piston 31 at its upperlend and withinshellpart 15T. 32 is ay bumper on thelower end of rod 26 tojcontact with the bottom end of shell 15 and 33 ber the air in the other chamber will exhaust through awpipe'39 inthe valve chamber. The valve may be oscillated by a vertical shaft 40, suitably journaled and on the upper part of said shaft is fixed a controlhan-I die 41 easilyv accessible to an operator. v

' 42f`ar`e a pair of vertical rods, one at each Yside of shell 15, each fixed at 43'to lower g Vtable 11 'extending upwardly through table,

10, and above said latter table having a spacer pipe 44. 45 is a segmental lever rest Y bored'at its opposite ends rfor the rods 42, one of the latter servingasA a fulcrum for a hand lever 46, resting on saidfsegment and adapted to be swung to Ydiametrical position Y on top of vcap 17 ofthe molding shell 16, to preventupward movement ofthe latter duringv thev moldingy operation ofmy device,

'presentlyl tok be described.

In the use of my device, core sand is first filled into-the upper end of'cylinder 15" flush with the top thereofthus filling the space above piston 31 in Fig. 4, orion top of piston 25 as in Fig. 2, it being understood l prong 33:5 is pressed upwardly to `torniV a cav-V linder 15, (as in Fig. 4).

ot course, that the mold cap or shell 16-17 has not been placed in position. Then the said shell 16-17 is placed concentrically on top oi' the cylinder between lugs 19, and lever 46 is swung as from dotted to full line position (Fig. 1) dian'ietrically across the cap 17 and in engagement therewith, the lever being swung into a notch olf a block 47 to hol-d it rigid. Now the valve lever 41 is manipulated So that compressed air enters chai'nber A forcing the piston rod 26 up wardly and the core sand above piston 31, (Fig. 4), is forced upwardly into shell 16 and compressed therein, it being understood that shell 16 is somewhat shorter than cylinder 15T, and lthe piston 31 moves only up to the top line of saidcylinder, also that ity Yin the coniipressed core sand. AThe saine ell'ect is produced in the lorm o 'li my machine .illustrated in Figs. l and 2, it being understood that-lever is swung outwardly caus ing rod 26 to be moved vertically and piston 25compressed the core sand in shell 16 as just described for Fig. 4.

48 is a U-shapedreach rod having its upper ends secured to ring 22 and its lower end engaged by a foot lever 49, which is 'liulc-rulned on a cross bar or shaft 5() in the lower part ol. the device. The iti-ee end ot' said lever 49 extends Aforwardly and carries a foot engaging pad 491', which the operator presses down alfter the core sand has been compressed as described. This downward pressure on lever 49, pulls `down on ring 22 which pulls bars 19 and lugs 19 downwardly against the pressure ol springs 20, said lugs thereby being pulled below the upper line oit' the cylinder and the shell 16 may be released, it being understood that the pressure pistonis first dropped back to original position.` Then the cap 1.7 may be unscrewed vand the complete core print pushed out ot the shell. l

In Figs. 3 and 4, I have shown a device for preventing the .completed core print from dropping' bach Ainto the cylinder from shell 16 when the operator causes rod 2G to bemoved. downwardly again alter the'above described pressure stroke. This device coinprises a ring 51 guided in'a circular groove in collar 18 and having an integral lever t2 for oscillating the ring. 58 are a number ot circular spaced inwardly directed cam arms each pivoted at 531 to the ring 51. Each cam is arch shaped and normally is slidable in a slot 54 near the upper edge of the cyl- It is obviousfthat when the crank 52 is swung' asfrom 'lullto vvent the dotted `line position, the cams 53 are projected into the upper end of the cylinder 15T, (Fig. 4), while the piston 31 is in its uppermost position, said piston having radial upwardly opening apertures 31A, registering with the apertures 54 and into which notches the said cams are projected. Thus when the piston Slis lowered, the cam arms 53 re pressed core in shell 16 from falling. i l y My device is particularly useful in makingy standard size core prints :tor coring the central apertures of cast steel car wheels, but it is obvious that the core prints whichl can bemade may be ot' various diameters and oft'v diiierent shapes in horizontal section, (not shown), and lwhen a complete bore is desired. through the core, the plug is simply provided. in necessary length anddiameter wanted.

55 in Fig. 4 is a sheet metal shield of circular shape resting on top of cylinder head 34 and formed with outwardly and downwardly directed slopes to catch the sand which may get below piston 31 and guide it outwardly to `prevent it from accumulating on the said cylinder head or getting into the lower cylinder 15.

I claim:

A core making machine comprising an upright `fixed cylinder member mounted in suitable framework, a piston reciprocable in said cylinder and a piston rod extending downwardly from said piston, a. molding cylinder adapted to be removably fixed concentrically on thevupper end of said .iiXed cylinder, said 'fixed cylinder adapted to be vfilled with core sand on top of the `piston when the latter in lowered position, said molding cylinder being shorter than thedistance from the lowest position or' thepiston to the top of theiixed cylinder, means for moving said piston upwardly to the top ot said fixed cylinder to compress the core sand in the molding cylinder, andV a core retai1iing device mountedl at the upper end of the .ixed cylinder comprising a series of circularly arranged inwardly directed and curved i cam arms, -an oscillatable: ring :about said cylinder, said cams fulcrumed on said ring, said upper end of the fixed cylinder provided with apertures slidably engaged each by one of said cam arms, means for oscillating said movable ring to move said cam arms inwardly to support the ylower part of the sand'core pressed into the molding cylinder.

In, testimony whereof I affixV my signature.

FRANK PinTRUsIAK.

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